Blackmagic Design HyperDeck Manuel D'utilisation Et D'installation page 239

The "watchdog" command instructs the deck to monitor the connected client and terminate the connection
if the client is inactive for at least a specified period of time.
To configure the watchdog:
watchdog: period: {period in seconds}↵
To avoid disconnection, the client must send a command to the server at least every {period} seconds. Note
that if the period is set to 0 or less than 0, connection monitoring will be disabled.
Developer Information 239